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Commit | Line | Data |
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3947be19 DH |
1 | /* |
2 | * drivers/base/memory.c - basic Memory class support | |
3 | * | |
4 | * Written by Matt Tolentino <matthew.e.tolentino@intel.com> | |
5 | * Dave Hansen <haveblue@us.ibm.com> | |
6 | * | |
7 | * This file provides the necessary infrastructure to represent | |
8 | * a SPARSEMEM-memory-model system's physical memory in /sysfs. | |
9 | * All arch-independent code that assumes MEMORY_HOTPLUG requires | |
10 | * SPARSEMEM should be contained here, or in mm/memory_hotplug.c. | |
11 | */ | |
12 | ||
13 | #include <linux/sysdev.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
3947be19 | 16 | #include <linux/topology.h> |
c59ede7b | 17 | #include <linux/capability.h> |
3947be19 DH |
18 | #include <linux/device.h> |
19 | #include <linux/memory.h> | |
20 | #include <linux/kobject.h> | |
21 | #include <linux/memory_hotplug.h> | |
22 | #include <linux/mm.h> | |
da19cbcf | 23 | #include <linux/mutex.h> |
9f1b16a5 | 24 | #include <linux/stat.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
9f1b16a5 | 26 | |
60063497 | 27 | #include <linux/atomic.h> |
3947be19 DH |
28 | #include <asm/uaccess.h> |
29 | ||
2938ffbd NF |
30 | static DEFINE_MUTEX(mem_sysfs_mutex); |
31 | ||
3947be19 | 32 | #define MEMORY_CLASS_NAME "memory" |
0c2c99b1 NF |
33 | |
34 | static int sections_per_block; | |
35 | ||
36 | static inline int base_memory_block_id(int section_nr) | |
37 | { | |
38 | return section_nr / sections_per_block; | |
39 | } | |
3947be19 DH |
40 | |
41 | static struct sysdev_class memory_sysdev_class = { | |
af5ca3f4 | 42 | .name = MEMORY_CLASS_NAME, |
3947be19 | 43 | }; |
3947be19 | 44 | |
312c004d | 45 | static const char *memory_uevent_name(struct kset *kset, struct kobject *kobj) |
3947be19 DH |
46 | { |
47 | return MEMORY_CLASS_NAME; | |
48 | } | |
49 | ||
85723943 WG |
50 | static int memory_uevent(struct kset *kset, struct kobject *obj, |
51 | struct kobj_uevent_env *env) | |
3947be19 DH |
52 | { |
53 | int retval = 0; | |
54 | ||
55 | return retval; | |
56 | } | |
57 | ||
9cd43611 | 58 | static const struct kset_uevent_ops memory_uevent_ops = { |
312c004d KS |
59 | .name = memory_uevent_name, |
60 | .uevent = memory_uevent, | |
3947be19 DH |
61 | }; |
62 | ||
e041c683 | 63 | static BLOCKING_NOTIFIER_HEAD(memory_chain); |
3947be19 | 64 | |
98a38ebd | 65 | int register_memory_notifier(struct notifier_block *nb) |
3947be19 | 66 | { |
e041c683 | 67 | return blocking_notifier_chain_register(&memory_chain, nb); |
3947be19 | 68 | } |
3c82c30c | 69 | EXPORT_SYMBOL(register_memory_notifier); |
3947be19 | 70 | |
98a38ebd | 71 | void unregister_memory_notifier(struct notifier_block *nb) |
3947be19 | 72 | { |
e041c683 | 73 | blocking_notifier_chain_unregister(&memory_chain, nb); |
3947be19 | 74 | } |
3c82c30c | 75 | EXPORT_SYMBOL(unregister_memory_notifier); |
3947be19 | 76 | |
925cc71e RJ |
77 | static ATOMIC_NOTIFIER_HEAD(memory_isolate_chain); |
78 | ||
79 | int register_memory_isolate_notifier(struct notifier_block *nb) | |
80 | { | |
81 | return atomic_notifier_chain_register(&memory_isolate_chain, nb); | |
82 | } | |
83 | EXPORT_SYMBOL(register_memory_isolate_notifier); | |
84 | ||
85 | void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
86 | { | |
87 | atomic_notifier_chain_unregister(&memory_isolate_chain, nb); | |
88 | } | |
89 | EXPORT_SYMBOL(unregister_memory_isolate_notifier); | |
90 | ||
3947be19 DH |
91 | /* |
92 | * register_memory - Setup a sysfs device for a memory block | |
93 | */ | |
00a41db5 | 94 | static |
0c2c99b1 | 95 | int register_memory(struct memory_block *memory) |
3947be19 DH |
96 | { |
97 | int error; | |
98 | ||
99 | memory->sysdev.cls = &memory_sysdev_class; | |
d3360164 | 100 | memory->sysdev.id = memory->start_section_nr / sections_per_block; |
3947be19 DH |
101 | |
102 | error = sysdev_register(&memory->sysdev); | |
3947be19 DH |
103 | return error; |
104 | } | |
105 | ||
106 | static void | |
0c2c99b1 | 107 | unregister_memory(struct memory_block *memory) |
3947be19 DH |
108 | { |
109 | BUG_ON(memory->sysdev.cls != &memory_sysdev_class); | |
3947be19 | 110 | |
00a41db5 BP |
111 | /* drop the ref. we got in remove_memory_block() */ |
112 | kobject_put(&memory->sysdev.kobj); | |
3947be19 | 113 | sysdev_unregister(&memory->sysdev); |
3947be19 DH |
114 | } |
115 | ||
0c2c99b1 NF |
116 | unsigned long __weak memory_block_size_bytes(void) |
117 | { | |
118 | return MIN_MEMORY_BLOCK_SIZE; | |
119 | } | |
120 | ||
121 | static unsigned long get_memory_block_size(void) | |
122 | { | |
123 | unsigned long block_sz; | |
124 | ||
125 | block_sz = memory_block_size_bytes(); | |
126 | ||
127 | /* Validate blk_sz is a power of 2 and not less than section size */ | |
128 | if ((block_sz & (block_sz - 1)) || (block_sz < MIN_MEMORY_BLOCK_SIZE)) { | |
129 | WARN_ON(1); | |
130 | block_sz = MIN_MEMORY_BLOCK_SIZE; | |
131 | } | |
132 | ||
133 | return block_sz; | |
134 | } | |
135 | ||
3947be19 DH |
136 | /* |
137 | * use this as the physical section index that this memsection | |
138 | * uses. | |
139 | */ | |
140 | ||
d3360164 | 141 | static ssize_t show_mem_start_phys_index(struct sys_device *dev, |
4a0b2b4d | 142 | struct sysdev_attribute *attr, char *buf) |
3947be19 DH |
143 | { |
144 | struct memory_block *mem = | |
145 | container_of(dev, struct memory_block, sysdev); | |
d3360164 NF |
146 | unsigned long phys_index; |
147 | ||
148 | phys_index = mem->start_section_nr / sections_per_block; | |
149 | return sprintf(buf, "%08lx\n", phys_index); | |
150 | } | |
151 | ||
152 | static ssize_t show_mem_end_phys_index(struct sys_device *dev, | |
153 | struct sysdev_attribute *attr, char *buf) | |
154 | { | |
155 | struct memory_block *mem = | |
156 | container_of(dev, struct memory_block, sysdev); | |
157 | unsigned long phys_index; | |
158 | ||
159 | phys_index = mem->end_section_nr / sections_per_block; | |
160 | return sprintf(buf, "%08lx\n", phys_index); | |
3947be19 DH |
161 | } |
162 | ||
5c755e9f BP |
163 | /* |
164 | * Show whether the section of memory is likely to be hot-removable | |
165 | */ | |
1f07be1c SR |
166 | static ssize_t show_mem_removable(struct sys_device *dev, |
167 | struct sysdev_attribute *attr, char *buf) | |
5c755e9f | 168 | { |
0c2c99b1 NF |
169 | unsigned long i, pfn; |
170 | int ret = 1; | |
5c755e9f BP |
171 | struct memory_block *mem = |
172 | container_of(dev, struct memory_block, sysdev); | |
173 | ||
0c2c99b1 | 174 | for (i = 0; i < sections_per_block; i++) { |
d3360164 | 175 | pfn = section_nr_to_pfn(mem->start_section_nr + i); |
0c2c99b1 NF |
176 | ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); |
177 | } | |
178 | ||
5c755e9f BP |
179 | return sprintf(buf, "%d\n", ret); |
180 | } | |
181 | ||
3947be19 DH |
182 | /* |
183 | * online, offline, going offline, etc. | |
184 | */ | |
4a0b2b4d AK |
185 | static ssize_t show_mem_state(struct sys_device *dev, |
186 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
187 | { |
188 | struct memory_block *mem = | |
189 | container_of(dev, struct memory_block, sysdev); | |
190 | ssize_t len = 0; | |
191 | ||
192 | /* | |
193 | * We can probably put these states in a nice little array | |
194 | * so that they're not open-coded | |
195 | */ | |
196 | switch (mem->state) { | |
197 | case MEM_ONLINE: | |
198 | len = sprintf(buf, "online\n"); | |
199 | break; | |
200 | case MEM_OFFLINE: | |
201 | len = sprintf(buf, "offline\n"); | |
202 | break; | |
203 | case MEM_GOING_OFFLINE: | |
204 | len = sprintf(buf, "going-offline\n"); | |
205 | break; | |
206 | default: | |
207 | len = sprintf(buf, "ERROR-UNKNOWN-%ld\n", | |
208 | mem->state); | |
209 | WARN_ON(1); | |
210 | break; | |
211 | } | |
212 | ||
213 | return len; | |
214 | } | |
215 | ||
7b78d335 | 216 | int memory_notify(unsigned long val, void *v) |
3947be19 | 217 | { |
e041c683 | 218 | return blocking_notifier_call_chain(&memory_chain, val, v); |
3947be19 DH |
219 | } |
220 | ||
925cc71e RJ |
221 | int memory_isolate_notify(unsigned long val, void *v) |
222 | { | |
223 | return atomic_notifier_call_chain(&memory_isolate_chain, val, v); | |
224 | } | |
225 | ||
3947be19 DH |
226 | /* |
227 | * MEMORY_HOTPLUG depends on SPARSEMEM in mm/Kconfig, so it is | |
228 | * OK to have direct references to sparsemem variables in here. | |
229 | */ | |
230 | static int | |
5409d2cd | 231 | memory_block_action(unsigned long phys_index, unsigned long action) |
3947be19 DH |
232 | { |
233 | int i; | |
3947be19 | 234 | unsigned long start_pfn, start_paddr; |
5409d2cd | 235 | unsigned long nr_pages = PAGES_PER_SECTION * sections_per_block; |
3947be19 DH |
236 | struct page *first_page; |
237 | int ret; | |
3947be19 | 238 | |
0c2c99b1 | 239 | first_page = pfn_to_page(phys_index << PFN_SECTION_SHIFT); |
3947be19 DH |
240 | |
241 | /* | |
242 | * The probe routines leave the pages reserved, just | |
243 | * as the bootmem code does. Make sure they're still | |
244 | * that way. | |
245 | */ | |
246 | if (action == MEM_ONLINE) { | |
5409d2cd | 247 | for (i = 0; i < nr_pages; i++) { |
3947be19 DH |
248 | if (PageReserved(first_page+i)) |
249 | continue; | |
250 | ||
251 | printk(KERN_WARNING "section number %ld page number %d " | |
0c2c99b1 NF |
252 | "not reserved, was it already online?\n", |
253 | phys_index, i); | |
3947be19 DH |
254 | return -EBUSY; |
255 | } | |
256 | } | |
257 | ||
258 | switch (action) { | |
259 | case MEM_ONLINE: | |
260 | start_pfn = page_to_pfn(first_page); | |
5409d2cd | 261 | ret = online_pages(start_pfn, nr_pages); |
3947be19 DH |
262 | break; |
263 | case MEM_OFFLINE: | |
3947be19 DH |
264 | start_paddr = page_to_pfn(first_page) << PAGE_SHIFT; |
265 | ret = remove_memory(start_paddr, | |
5409d2cd | 266 | nr_pages << PAGE_SHIFT); |
3947be19 DH |
267 | break; |
268 | default: | |
0c2c99b1 NF |
269 | WARN(1, KERN_WARNING "%s(%ld, %ld) unknown action: " |
270 | "%ld\n", __func__, phys_index, action, action); | |
3947be19 DH |
271 | ret = -EINVAL; |
272 | } | |
3947be19 DH |
273 | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static int memory_block_change_state(struct memory_block *mem, | |
278 | unsigned long to_state, unsigned long from_state_req) | |
279 | { | |
a236c717 | 280 | int ret = 0; |
0c2c99b1 | 281 | |
da19cbcf | 282 | mutex_lock(&mem->state_mutex); |
3947be19 DH |
283 | |
284 | if (mem->state != from_state_req) { | |
285 | ret = -EINVAL; | |
286 | goto out; | |
287 | } | |
288 | ||
0c2c99b1 NF |
289 | if (to_state == MEM_OFFLINE) |
290 | mem->state = MEM_GOING_OFFLINE; | |
291 | ||
5409d2cd | 292 | ret = memory_block_action(mem->start_section_nr, to_state); |
0c2c99b1 | 293 | |
5409d2cd | 294 | if (ret) |
0c2c99b1 | 295 | mem->state = from_state_req; |
5409d2cd | 296 | else |
3947be19 DH |
297 | mem->state = to_state; |
298 | ||
299 | out: | |
da19cbcf | 300 | mutex_unlock(&mem->state_mutex); |
3947be19 DH |
301 | return ret; |
302 | } | |
303 | ||
304 | static ssize_t | |
4a0b2b4d AK |
305 | store_mem_state(struct sys_device *dev, |
306 | struct sysdev_attribute *attr, const char *buf, size_t count) | |
3947be19 DH |
307 | { |
308 | struct memory_block *mem; | |
3947be19 DH |
309 | int ret = -EINVAL; |
310 | ||
311 | mem = container_of(dev, struct memory_block, sysdev); | |
3947be19 DH |
312 | |
313 | if (!strncmp(buf, "online", min((int)count, 6))) | |
314 | ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); | |
315 | else if(!strncmp(buf, "offline", min((int)count, 7))) | |
316 | ret = memory_block_change_state(mem, MEM_OFFLINE, MEM_ONLINE); | |
0c2c99b1 | 317 | |
3947be19 DH |
318 | if (ret) |
319 | return ret; | |
320 | return count; | |
321 | } | |
322 | ||
323 | /* | |
324 | * phys_device is a bad name for this. What I really want | |
325 | * is a way to differentiate between memory ranges that | |
326 | * are part of physical devices that constitute | |
327 | * a complete removable unit or fru. | |
328 | * i.e. do these ranges belong to the same physical device, | |
329 | * s.t. if I offline all of these sections I can then | |
330 | * remove the physical device? | |
331 | */ | |
4a0b2b4d AK |
332 | static ssize_t show_phys_device(struct sys_device *dev, |
333 | struct sysdev_attribute *attr, char *buf) | |
3947be19 DH |
334 | { |
335 | struct memory_block *mem = | |
336 | container_of(dev, struct memory_block, sysdev); | |
337 | return sprintf(buf, "%d\n", mem->phys_device); | |
338 | } | |
339 | ||
d3360164 NF |
340 | static SYSDEV_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL); |
341 | static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL); | |
3947be19 DH |
342 | static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state); |
343 | static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL); | |
5c755e9f | 344 | static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL); |
3947be19 DH |
345 | |
346 | #define mem_create_simple_file(mem, attr_name) \ | |
347 | sysdev_create_file(&mem->sysdev, &attr_##attr_name) | |
348 | #define mem_remove_simple_file(mem, attr_name) \ | |
349 | sysdev_remove_file(&mem->sysdev, &attr_##attr_name) | |
350 | ||
351 | /* | |
352 | * Block size attribute stuff | |
353 | */ | |
354 | static ssize_t | |
8564a6c1 AK |
355 | print_block_size(struct sysdev_class *class, struct sysdev_class_attribute *attr, |
356 | char *buf) | |
3947be19 | 357 | { |
0c2c99b1 | 358 | return sprintf(buf, "%lx\n", get_memory_block_size()); |
3947be19 DH |
359 | } |
360 | ||
8564a6c1 | 361 | static SYSDEV_CLASS_ATTR(block_size_bytes, 0444, print_block_size, NULL); |
3947be19 DH |
362 | |
363 | static int block_size_init(void) | |
364 | { | |
28ec24e2 | 365 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
8564a6c1 | 366 | &attr_block_size_bytes.attr); |
3947be19 DH |
367 | } |
368 | ||
369 | /* | |
370 | * Some architectures will have custom drivers to do this, and | |
371 | * will not need to do it from userspace. The fake hot-add code | |
372 | * as well as ppc64 will do all of their discovery in userspace | |
373 | * and will require this interface. | |
374 | */ | |
375 | #ifdef CONFIG_ARCH_MEMORY_PROBE | |
376 | static ssize_t | |
28812fe1 AK |
377 | memory_probe_store(struct class *class, struct class_attribute *attr, |
378 | const char *buf, size_t count) | |
3947be19 DH |
379 | { |
380 | u64 phys_addr; | |
bc02af93 | 381 | int nid; |
6add7cd6 | 382 | int i, ret; |
3947be19 DH |
383 | |
384 | phys_addr = simple_strtoull(buf, NULL, 0); | |
385 | ||
6add7cd6 NF |
386 | for (i = 0; i < sections_per_block; i++) { |
387 | nid = memory_add_physaddr_to_nid(phys_addr); | |
388 | ret = add_memory(nid, phys_addr, | |
389 | PAGES_PER_SECTION << PAGE_SHIFT); | |
390 | if (ret) | |
9f0af69b | 391 | goto out; |
6add7cd6 NF |
392 | |
393 | phys_addr += MIN_MEMORY_BLOCK_SIZE; | |
394 | } | |
3947be19 | 395 | |
9f0af69b NK |
396 | ret = count; |
397 | out: | |
398 | return ret; | |
3947be19 | 399 | } |
bd796671 | 400 | static CLASS_ATTR(probe, S_IWUSR, NULL, memory_probe_store); |
3947be19 DH |
401 | |
402 | static int memory_probe_init(void) | |
403 | { | |
28ec24e2 | 404 | return sysfs_create_file(&memory_sysdev_class.kset.kobj, |
bd796671 | 405 | &class_attr_probe.attr); |
3947be19 DH |
406 | } |
407 | #else | |
28ec24e2 AM |
408 | static inline int memory_probe_init(void) |
409 | { | |
410 | return 0; | |
411 | } | |
3947be19 DH |
412 | #endif |
413 | ||
facb6011 AK |
414 | #ifdef CONFIG_MEMORY_FAILURE |
415 | /* | |
416 | * Support for offlining pages of memory | |
417 | */ | |
418 | ||
419 | /* Soft offline a page */ | |
420 | static ssize_t | |
28812fe1 AK |
421 | store_soft_offline_page(struct class *class, |
422 | struct class_attribute *attr, | |
423 | const char *buf, size_t count) | |
facb6011 AK |
424 | { |
425 | int ret; | |
426 | u64 pfn; | |
427 | if (!capable(CAP_SYS_ADMIN)) | |
428 | return -EPERM; | |
429 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
430 | return -EINVAL; | |
431 | pfn >>= PAGE_SHIFT; | |
432 | if (!pfn_valid(pfn)) | |
433 | return -ENXIO; | |
434 | ret = soft_offline_page(pfn_to_page(pfn), 0); | |
435 | return ret == 0 ? count : ret; | |
436 | } | |
437 | ||
438 | /* Forcibly offline a page, including killing processes. */ | |
439 | static ssize_t | |
28812fe1 AK |
440 | store_hard_offline_page(struct class *class, |
441 | struct class_attribute *attr, | |
442 | const char *buf, size_t count) | |
facb6011 AK |
443 | { |
444 | int ret; | |
445 | u64 pfn; | |
446 | if (!capable(CAP_SYS_ADMIN)) | |
447 | return -EPERM; | |
448 | if (strict_strtoull(buf, 0, &pfn) < 0) | |
449 | return -EINVAL; | |
450 | pfn >>= PAGE_SHIFT; | |
451 | ret = __memory_failure(pfn, 0, 0); | |
452 | return ret ? ret : count; | |
453 | } | |
454 | ||
bd796671 GKH |
455 | static CLASS_ATTR(soft_offline_page, 0644, NULL, store_soft_offline_page); |
456 | static CLASS_ATTR(hard_offline_page, 0644, NULL, store_hard_offline_page); | |
facb6011 AK |
457 | |
458 | static __init int memory_fail_init(void) | |
459 | { | |
460 | int err; | |
461 | ||
462 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 463 | &class_attr_soft_offline_page.attr); |
facb6011 AK |
464 | if (!err) |
465 | err = sysfs_create_file(&memory_sysdev_class.kset.kobj, | |
bd796671 | 466 | &class_attr_hard_offline_page.attr); |
facb6011 AK |
467 | return err; |
468 | } | |
469 | #else | |
470 | static inline int memory_fail_init(void) | |
471 | { | |
472 | return 0; | |
473 | } | |
474 | #endif | |
475 | ||
3947be19 DH |
476 | /* |
477 | * Note that phys_device is optional. It is here to allow for | |
478 | * differentiation between which *physical* devices each | |
479 | * section belongs to... | |
480 | */ | |
bc32df00 HC |
481 | int __weak arch_get_memory_phys_device(unsigned long start_pfn) |
482 | { | |
483 | return 0; | |
484 | } | |
3947be19 | 485 | |
98383031 RH |
486 | struct memory_block *find_memory_block_hinted(struct mem_section *section, |
487 | struct memory_block *hint) | |
3947be19 DH |
488 | { |
489 | struct kobject *kobj; | |
490 | struct sys_device *sysdev; | |
491 | struct memory_block *mem; | |
492 | char name[sizeof(MEMORY_CLASS_NAME) + 9 + 1]; | |
0c2c99b1 | 493 | int block_id = base_memory_block_id(__section_nr(section)); |
3947be19 | 494 | |
98383031 RH |
495 | kobj = hint ? &hint->sysdev.kobj : NULL; |
496 | ||
3947be19 DH |
497 | /* |
498 | * This only works because we know that section == sysdev->id | |
499 | * slightly redundant with sysdev_register() | |
500 | */ | |
0c2c99b1 | 501 | sprintf(&name[0], "%s%d", MEMORY_CLASS_NAME, block_id); |
3947be19 | 502 | |
98383031 | 503 | kobj = kset_find_obj_hinted(&memory_sysdev_class.kset, name, kobj); |
3947be19 DH |
504 | if (!kobj) |
505 | return NULL; | |
506 | ||
507 | sysdev = container_of(kobj, struct sys_device, kobj); | |
508 | mem = container_of(sysdev, struct memory_block, sysdev); | |
509 | ||
510 | return mem; | |
511 | } | |
512 | ||
98383031 RH |
513 | /* |
514 | * For now, we have a linear search to go find the appropriate | |
515 | * memory_block corresponding to a particular phys_index. If | |
516 | * this gets to be a real problem, we can always use a radix | |
517 | * tree or something here. | |
518 | * | |
519 | * This could be made generic for all sysdev classes. | |
520 | */ | |
521 | struct memory_block *find_memory_block(struct mem_section *section) | |
522 | { | |
523 | return find_memory_block_hinted(section, NULL); | |
524 | } | |
525 | ||
0c2c99b1 NF |
526 | static int init_memory_block(struct memory_block **memory, |
527 | struct mem_section *section, unsigned long state) | |
e4619c85 | 528 | { |
0c2c99b1 | 529 | struct memory_block *mem; |
e4619c85 | 530 | unsigned long start_pfn; |
0c2c99b1 | 531 | int scn_nr; |
e4619c85 NF |
532 | int ret = 0; |
533 | ||
0c2c99b1 | 534 | mem = kzalloc(sizeof(*mem), GFP_KERNEL); |
e4619c85 NF |
535 | if (!mem) |
536 | return -ENOMEM; | |
537 | ||
0c2c99b1 | 538 | scn_nr = __section_nr(section); |
d3360164 NF |
539 | mem->start_section_nr = |
540 | base_memory_block_id(scn_nr) * sections_per_block; | |
541 | mem->end_section_nr = mem->start_section_nr + sections_per_block - 1; | |
e4619c85 | 542 | mem->state = state; |
07681215 | 543 | mem->section_count++; |
e4619c85 | 544 | mutex_init(&mem->state_mutex); |
d3360164 | 545 | start_pfn = section_nr_to_pfn(mem->start_section_nr); |
e4619c85 NF |
546 | mem->phys_device = arch_get_memory_phys_device(start_pfn); |
547 | ||
0c2c99b1 | 548 | ret = register_memory(mem); |
e4619c85 NF |
549 | if (!ret) |
550 | ret = mem_create_simple_file(mem, phys_index); | |
d3360164 NF |
551 | if (!ret) |
552 | ret = mem_create_simple_file(mem, end_phys_index); | |
e4619c85 NF |
553 | if (!ret) |
554 | ret = mem_create_simple_file(mem, state); | |
555 | if (!ret) | |
556 | ret = mem_create_simple_file(mem, phys_device); | |
557 | if (!ret) | |
558 | ret = mem_create_simple_file(mem, removable); | |
0c2c99b1 NF |
559 | |
560 | *memory = mem; | |
561 | return ret; | |
562 | } | |
563 | ||
564 | static int add_memory_section(int nid, struct mem_section *section, | |
565 | unsigned long state, enum mem_add_context context) | |
566 | { | |
567 | struct memory_block *mem; | |
568 | int ret = 0; | |
569 | ||
570 | mutex_lock(&mem_sysfs_mutex); | |
571 | ||
572 | mem = find_memory_block(section); | |
573 | if (mem) { | |
574 | mem->section_count++; | |
575 | kobject_put(&mem->sysdev.kobj); | |
576 | } else | |
577 | ret = init_memory_block(&mem, section, state); | |
578 | ||
e4619c85 | 579 | if (!ret) { |
0c2c99b1 NF |
580 | if (context == HOTPLUG && |
581 | mem->section_count == sections_per_block) | |
e4619c85 NF |
582 | ret = register_mem_sect_under_node(mem, nid); |
583 | } | |
584 | ||
2938ffbd | 585 | mutex_unlock(&mem_sysfs_mutex); |
e4619c85 NF |
586 | return ret; |
587 | } | |
588 | ||
3947be19 DH |
589 | int remove_memory_block(unsigned long node_id, struct mem_section *section, |
590 | int phys_device) | |
591 | { | |
592 | struct memory_block *mem; | |
593 | ||
2938ffbd | 594 | mutex_lock(&mem_sysfs_mutex); |
3947be19 | 595 | mem = find_memory_block(section); |
d3360164 | 596 | unregister_mem_sect_under_nodes(mem, __section_nr(section)); |
07681215 NF |
597 | |
598 | mem->section_count--; | |
599 | if (mem->section_count == 0) { | |
07681215 | 600 | mem_remove_simple_file(mem, phys_index); |
d3360164 | 601 | mem_remove_simple_file(mem, end_phys_index); |
07681215 NF |
602 | mem_remove_simple_file(mem, state); |
603 | mem_remove_simple_file(mem, phys_device); | |
604 | mem_remove_simple_file(mem, removable); | |
0c2c99b1 NF |
605 | unregister_memory(mem); |
606 | kfree(mem); | |
607 | } else | |
608 | kobject_put(&mem->sysdev.kobj); | |
3947be19 | 609 | |
2938ffbd | 610 | mutex_unlock(&mem_sysfs_mutex); |
3947be19 DH |
611 | return 0; |
612 | } | |
613 | ||
614 | /* | |
615 | * need an interface for the VM to add new memory regions, | |
616 | * but without onlining it. | |
617 | */ | |
c04fc586 | 618 | int register_new_memory(int nid, struct mem_section *section) |
3947be19 | 619 | { |
0c2c99b1 | 620 | return add_memory_section(nid, section, MEM_OFFLINE, HOTPLUG); |
3947be19 DH |
621 | } |
622 | ||
623 | int unregister_memory_section(struct mem_section *section) | |
624 | { | |
540557b9 | 625 | if (!present_section(section)) |
3947be19 DH |
626 | return -EINVAL; |
627 | ||
628 | return remove_memory_block(0, section, 0); | |
629 | } | |
630 | ||
631 | /* | |
632 | * Initialize the sysfs support for memory devices... | |
633 | */ | |
634 | int __init memory_dev_init(void) | |
635 | { | |
636 | unsigned int i; | |
637 | int ret; | |
28ec24e2 | 638 | int err; |
0c2c99b1 | 639 | unsigned long block_sz; |
3947be19 | 640 | |
312c004d | 641 | memory_sysdev_class.kset.uevent_ops = &memory_uevent_ops; |
3947be19 | 642 | ret = sysdev_class_register(&memory_sysdev_class); |
28ec24e2 AM |
643 | if (ret) |
644 | goto out; | |
3947be19 | 645 | |
0c2c99b1 NF |
646 | block_sz = get_memory_block_size(); |
647 | sections_per_block = block_sz / MIN_MEMORY_BLOCK_SIZE; | |
648 | ||
3947be19 DH |
649 | /* |
650 | * Create entries for memory sections that were found | |
651 | * during boot and have been initialized | |
652 | */ | |
653 | for (i = 0; i < NR_MEM_SECTIONS; i++) { | |
540557b9 | 654 | if (!present_section_nr(i)) |
3947be19 | 655 | continue; |
0c2c99b1 NF |
656 | err = add_memory_section(0, __nr_to_section(i), MEM_ONLINE, |
657 | BOOT); | |
28ec24e2 AM |
658 | if (!ret) |
659 | ret = err; | |
3947be19 DH |
660 | } |
661 | ||
28ec24e2 | 662 | err = memory_probe_init(); |
facb6011 AK |
663 | if (!ret) |
664 | ret = err; | |
665 | err = memory_fail_init(); | |
28ec24e2 AM |
666 | if (!ret) |
667 | ret = err; | |
668 | err = block_size_init(); | |
669 | if (!ret) | |
670 | ret = err; | |
671 | out: | |
672 | if (ret) | |
2b3a302a | 673 | printk(KERN_ERR "%s() failed: %d\n", __func__, ret); |
3947be19 DH |
674 | return ret; |
675 | } |